Were you asking me for the bolt pattern on the trans itself in my 8.8 build post? If so, I misunderstood you. Which trans? I can pull the dimensions off the bottom of an ax5 or an nv3550 if you need them.

So to make sure I'm understanding this correctly, you are trying to get the measurements for where the factory trans mount bolts into the factory skid right? If so, I can take measurements off my skid if a mount for yours is the same as a mount for a 97 2.5 ax5. Compare part numbers and let me know. I actually cut up a factory skid to get that piece out of it previously before I decided to do mine how I did.

For the jig, I built it with it bolted onto my dana 35. I drilled out some round tubing drilled out to the correct sizes for the bolts. Then, I just bolted them into the mounts and built a jig off of them.

Well i have a different trans.. I have the NV3550 so ill need that one. I just orderd a lo pro mount from under cover fab, so i think i can just use those? Also do you think adding a few washers between the frame and skid will help if i get vibes?

Are you trying to do a flat skid without doing a SYE and CV driveshaft? I have the skid from an NV3550 as well. I also have the trans. If you are using undercover fab's low pro mount, it looks like you'll need to use the factory trans mount bracket but grind the edge off of it for clearance.